#![allow(unused_imports)]
use std::cmp::*;
use std::collections::*;
use std::io::Write;
use std::ops::Bound::*;

#[allow(unused_macros)]
macro_rules! debug {
    ($($e:expr),*) => {
        #[cfg(debug_assertions)]
        $({
            let (e, mut err) = (stringify!($e), std::io::stderr());
            writeln!(err, "{} = {:?}", e, $e).unwrap()
        })*
    };
}

fn main() {
    let v = read_vec::<i64>();
    let (n, w) = (v[0] as usize, v[1]);
    let mut a = vec![0; n];
    for i in 0..n {
        a[i] = read::<i64>();
    }

    let mut counts = HashMap::new();
    let mut s = 0;
    let mut sum = 0;
    let mut t = 0;
    let mut ans = 0;
    while s < n {
        if t < s {
            t = s;
        }
        while t < n && sum + a[t] <= w && (!counts.contains_key(&a[t]) || counts[&a[t]] == 0) {
            sum += a[t];
            *counts.entry(a[t]).or_insert(0) += 1;
            t += 1;
        }
        ans = max(ans, t - s);
        if t > s {
            sum -= a[s];
            *counts.get_mut(&a[s]).unwrap() -= 1;
        }
        s += 1;
    }
    println!("{}", ans);
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}